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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '326e187a93d7d250529bb6e52d27a823bcfbca47e2ae9031c31eda14cad72599' 
  AND token = 'iZ6y2iy6osPr/Mqf0WfgUBtOKPyT2/H2iTMXyvpZ9xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}